Chief military prosecutor, Major General Joseph Ponde, said two men had been arrested for allegedly killing American Michael Sharp and Swedish-Chilean Zaida Catalan in central Kasai, where hundreds of people have died in violence since September.
One of the suspects, however, had escaped with the help of four police officers guarding them, Ponde told a news conference.
The remaining suspect was being interrogated in Kananga, capital of diamond-rich Kasai, which has been gripped by a violent tribal uprising since traditional chieftain Kamwina Nsapu was killed in August last year.
"The judicial inquiry will determine whether Kamwina Nsapu rebels or elements from the security forces" were behind the killings, Ponde said.
Democratic Republic of Congo security forces have been accused by the UN of using disproportionate force against the militiamen, who are armed mainly with clubs and catapults.
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